Siemens CU230P-2 Operations Instructions Page 329

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Appendix
A.1 Application examples
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
327
Note regarding the universal module
It is not permissible to configure the universal module with the following properties:
PZD length 4/4 words
Consistent over the complete length
With these properties, the universal module has the same DP identifier (4AX) as the "PKW
channel 4 words" and is therefore identified as such by the higher-level control. As a
consequence, the control does not establish cyclic communication with the inverter.
Remedy: Change the length to 8/8 bytes in the properties of the DP slave. As an alternative,
you can also change the consistency to "unit".
Final steps
Save and compile the project in STEP 7.
Establish an online connection between your PC and the S7 CPU and download the
project data to the S7 CPU.
In the inverter, select the telegram type, which you configured in STEP 7, using
parameter P0922.
The inverter is now connected to the S7 CPU. This therefore defines the communication
interface between the CPU and the inverter. An example of how you can supply this
interface with data can be found in the next section.
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